Use After Free in Electron
CVE-2026-34774
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 39.8.1, 40.7.0, and 41.0.0, apps that use offscreen rendering and allow child windows via window.open() may be vulnerable to a use-after-free. If the parent offscreen WebContents is destroyed while a child window remains open, subsequent paint frames on the child dereference freed memory, which may lead to a crash or memory corruption. Apps are only affected if they use offscreen rendering (webPreferences.offscreen: true) and their setWindowOpenHandler permits child windows. Apps that do not use offscreen rendering, or that deny child windows, are not affected. This issue has been patched in versions 39.8.1, 40.7.0, and 41.0.0.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.005 · change: -0.001
Affected products
- Electron — versions < 39.8.1, >= 40.0.0-alpha.1, < 40.7.0, >= 41.0.0-alpha.1, < 41.0.0
- Electronjs Electron — versions 41.0.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-34774?
- CVE-2026-34774 is a high-severity vulnerability in Electron, classified under Use After Free. CVSS score: 8.1/10. Published 2026-04-04.
- How severe is CVE-2026-34774?
- High severity. CVSS v3 base score is 8.1 out of 10.